99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
/*
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* This file uses XZ Embedded library code which is written
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* by Lasse Collin <lasse.collin@tukaani.org>
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* and Igor Pavlov <http://7-zip.org/>
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*
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* See README file in unxz/ directory for more information.
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*
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* This file is:
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* Copyright (C) 2010 Denys Vlasenko <vda.linux@googlemail.com>
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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#include "archive.h"
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#define XZ_FUNC FAST_FUNC
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#define XZ_EXTERN static
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#define XZ_DEC_DYNALLOC
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/* Skip check (rather than fail) of unsupported hash functions */
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#define XZ_DEC_ANY_CHECK 1
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/* We use our own crc32 function */
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#define XZ_INTERNAL_CRC32 0
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static uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc)
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{
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return ~crc32_block_endian0(~crc, buf, size, global_crc32_table);
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}
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/* We use arch-optimized unaligned accessors */
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#define get_unaligned_le32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_LE32(v); })
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#define get_unaligned_be32(buf) ({ uint32_t v; move_from_unaligned32(v, buf); SWAP_BE32(v); })
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#define put_unaligned_le32(val, buf) move_to_unaligned16(buf, SWAP_LE32(val))
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#define put_unaligned_be32(val, buf) move_to_unaligned16(buf, SWAP_BE32(val))
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#include "unxz/xz_dec_bcj.c"
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#include "unxz/xz_dec_lzma2.c"
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#include "unxz/xz_dec_stream.c"
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IF_DESKTOP(long long) int FAST_FUNC
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unpack_xz_stream(int src_fd, int dst_fd)
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{
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struct xz_buf iobuf;
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struct xz_dec *state;
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unsigned char *membuf;
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IF_DESKTOP(long long) int total = 0;
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if (!global_crc32_table)
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global_crc32_table = crc32_filltable(NULL, /*endian:*/ 0);
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memset(&iobuf, 0, sizeof(iobuf));
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/* Preload XZ file signature */
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membuf = (void*) strcpy(xmalloc(2 * BUFSIZ), HEADER_MAGIC);
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iobuf.in = membuf;
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iobuf.in_size = HEADER_MAGIC_SIZE;
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iobuf.out = membuf + BUFSIZ;
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iobuf.out_size = BUFSIZ;
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/* Limit memory usage to about 64 MiB. */
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state = xz_dec_init(XZ_DYNALLOC, 64*1024*1024);
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while (1) {
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enum xz_ret r;
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if (iobuf.in_pos == iobuf.in_size) {
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int rd = safe_read(src_fd, membuf, BUFSIZ);
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if (rd < 0) {
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bb_error_msg(bb_msg_read_error);
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total = -1;
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break;
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}
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iobuf.in_size = rd;
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iobuf.in_pos = 0;
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}
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// bb_error_msg(">in pos:%d size:%d out pos:%d size:%d",
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// iobuf.in_pos, iobuf.in_size, iobuf.out_pos, iobuf.out_size);
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r = xz_dec_run(state, &iobuf);
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// bb_error_msg("<in pos:%d size:%d out pos:%d size:%d r:%d",
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// iobuf.in_pos, iobuf.in_size, iobuf.out_pos, iobuf.out_size, r);
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if (iobuf.out_pos) {
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xwrite(dst_fd, iobuf.out, iobuf.out_pos);
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IF_DESKTOP(total += iobuf.out_pos;)
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iobuf.out_pos = 0;
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}
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if (r == XZ_STREAM_END) {
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break;
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}
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if (r != XZ_OK && r != XZ_UNSUPPORTED_CHECK) {
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bb_error_msg("corrupted data");
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total = -1;
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break;
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}
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}
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xz_dec_end(state);
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free(membuf);
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return total;
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}
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